Machines for hot ingots



May 13, 1958 s. CAPETTl 2,834,259

MACHINES FOR HOT INGOTS Filed Aug. 30, 1955 IN VENTOR Scipione capetti ATTORNEY MACHINES FOR HOT INGOTS Scipione Capetti, Milan, Italy, assignor to Innocenti cietzl Generale per llndustrie Metallurgica e Meccamca,

Milan, Italy Application August 30, 1955, Serial No. 531,388

Claims priority, application Italy September 14, 1954 1 Claim. (Cl. 90-18) The present invention relates to machine tools (milling machines, lathes, and the like) in which there are worked superficially, by cutting operations, ingots or billets of steel or of various metals brought to a temperature of softness (e. g., for steel, to about l200 (3.).

It is known how under such conditions of softness of the metals, the cutting operation requires smaller effort and, therefore, it is possible to attain high output in machines of that kind.

If such machines are used in the cycle of metallurgical treatment, it is advisable that the loss of heat from the ingot or billet be as small as possible, in order that the ingot or billet may be passed on to a rolling operation, after surface working, without the necessity of subsequent reheating.

On the other hand, the heat radiated by the ingot or billet during surface working damages the mechanical members of the machine tool, causing deformations prejudicial to the satisfactory operation thereof.

It is an object of the present invention to provide a par ticular protecting device interposed between the piece to be worked (ingot or billet) and the mechanical members of the machine under such conditions that by avoiding currents and circulation of air the temperature drop by convection in the ingot may remain reduced to a minimum, while eliminating the disadvantages of the radiated heat by preventing it from reaching the mechanical members of the machine.

By way of example, in Figures 1, 2, 3, 4, there is represented one form of embodiment of the present invention with reference to a milling machine for hot ingots, for removing therefrom the superficial crust.

In the accompanying drawing, Fig. 1 represents in front view the milling machine to which the device of the invention is applied; Fig. 2 is a plan view of the machine of Fig. 1; Fig. 3 is a section along the axis of the movable carriage; and Fig. 4 represents in larger scale the part of Fig. 3 which more particularly relates to the invention.

With reference to these figures, the milling tool 1 is rotated by conventional means, e. g. by a speed reducer 2 and by an electric motor 3 disposed in front of the ingot 4 to be worked, which is carried by a movable carriage 5 displaced along a fixed base 6 by means of suitable conventional means such as e. g. a piston 7 in a hydraulic cylinder 8.

The ingots 4 is secured rigidly to the movable carriage by suitable holding chucks or vices 9-10 actuated e. g. by hydraulic jacks.

hired States Patent Q 2,834,259 Fatented May 13, 1958 In accordance with the present invention, on the movable carriage around the ingot 4 to be worked there is provided a recess lined on all sides, except the side facing the milling tool, by metallic cases 1l-11'11" which are independent elements, or united together in one single piece, and which are hollow. Water is circulated through the hollow interiors of the cases 11, 11 and 11", and such water enters the cases through delivery pipes 12, to which a flexible water delivery hose 13 is connected, and is discharged through a return pipe 14 which is, in turn, connected to a flexible water return hose 15. As shown in Fig. 4, the carriage 5 may also be of hollow construction, particularly at the top thereof, with the hollow top portion of the carriage 5 being in communication with the hollow case 11, and, in that event, the return pipe 14 may extend from the top portion of carriage 5, p as shown, to cause the water to also circulate through the latter.

Since the ingot is enclosed by the recess formed by the metallic cases 11, 11, 11" (which are interposed at a certain distance between the ingot 4 and the structures of the movable carriage 5), ventilating movements of the surrounding air past the ingot are strongly discouraged and, therefore, loss of heat from the ingot by convection is correspondingly greatly reduced, while the amount of heat radiated from the ingot impinges on the surface of the cases facing the ingot and heats them. The heat thus transmitted to the cases 11, 11' and 11" is, to some extent, radiated from the latter back to the ingot, and the remainder of the heat absorbed by the cases is removed by the circulating water, preventing it from being transferred to the resistant structures and to the mechanical members of the movable carriage.

I claim:

In a machine tool for removing the superficial crusts from hot metal ingots, a device for reducing the heat loss from a hot ingot during working on the latter and for shielding the parts of the machine tool from heat from the hot ingot; said device comprising a metal case having hollow top, bottom, back and opposite side portions defining a recess open only at the front thereof to loosely receive a hot ingot during the performance of work on the latter by the machine tool with the metal case being spaced from the hot ingot so that the ventilating movement of the surrounding air past the hot ingot is discouraged, thereby to reduce the loss of heat from the ingot by convection and to reflect back to the ingot at least some of the heat radiated from the ingot, and means for circulating cooling water through said hollow portions of the metal case, thereby to remove heat absorbed from the hot ingot by said metal case and to avoid the transmission of the absorbed heat to adjacent parts of the machine tool.

References Cited in the file of this patent UNITED STATES PATENTS 268,259 McDonald Nov. 28, 1882 2,161,570 Harris June 6, 1939 2,317,495 Thompson et al. Apr. 27, 1943 2,600,453 Weingart June 17, 1952 

